Process of agglomerating flue-dust or other finely-divided material.



c. GIESECKE. PROCESS OF AGGLOMERATING FLUE DUST OR OTHER FINELY DIVIDEDMATERIAL.

APPLICATION FILED MAY 10. 19l5.

Patented Nov. 30, 1915.

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CARL GIESECKE, OF BRUE'SWIGK, GERMANY. I

PROCESS .OF AGGLOMERA'IING ELITE-DUST OR OTHER FINELY-DIVIDED MATERIAL.

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Specification of Letters latent. Pate ted Nov. 3(1 1915.;

Application filed May 10, 1915. Serial 1%. 2731.4.

To all whom it may concern a Be .it' known that/I, GARL Grnsnon'n,engineer', citizen of the Duchy of Brunswick, Empire of Germany,residing at Brunswick, Germany, have invented certain new and usefulImprovements in Processes of Agglomerating Flue-Dust or other Finely-Divided Material, of which the following is a specification. i

My invention relates to improvements in the process of burning oragglomerating dust from the throats of high furnaces, fine ore,- and thelike, and the object of-the improvements is to provide a process wherebythe said materials are baked together or agglomerated.

In the preferred form of the invention the dust or fine ore is moisteneda little and charged in a shaft furnace, as is known in the art. In acertain zone of the said shaft furnace the material is subjected to thesudden action of high heat, and immediately after leaving the said zone,it is rapidly cooled by the action of blasts of compressed air. By thussuddenly heating the material -it is baked together so as to form lumpsof larger or smaller size, and, yet the particles are not molten orfused together. By suddenly cooling said lumps inner strains are caused,which burst the big lumps apart, so that the product Withdrawn from thefurnace is in the form of pieces which are suitable for furthertreatment. In order to produce the high temperature which is necessaryfor suddenly heating the material and also'to produce the immediatelyfollowing rapid cooling of. the material I supply compressed air to themixture of fuel and material to be burnt which is passing downwardwithin the furnace, the said com-- pressed air being supplied within anannular Zone and from the side through the wall of the furnace andtangentially of the inner part of the furnace. By thus supplying thecompressed air, the-zone within which high heat is produced is exactlylimited at its been heated is suddenly passed from the hot zone to thecold one in which cooling takes place.

A furnace for carrying the invention into effect is illustrated. in theaccompanying drawing wherein Figure l is a vertical sectional view, andF ig. 2 is a horizontal sectional view on. the line 22 of Fig. 1,looking downwardly.

The furnace includes a shaft?) arranged above a grate portion 57 andsurmounted by a cupola a having suitable openings (not shown) throughwhich the flue dust or like material, after having been previouslymois-- tened, is introduced. The shaft 6 is nearly surrounded by. anannular air supply pipe 0 connected to a source of compressed air (notshown) and said pipe is provided with several branch tubes arranged atappropriate intervals throughout its' extent and by which it isconnected to the shaft 6, the tubesal opening to the interior of saidshaft and being disposed tangentially to an imaginary circle within andconcentric to. said ther cooling of the material takes place in thegrate g. Inasmuch as the material descends through the furnace in auniform current and at a measurably fair speed, the materialwhich,-while it forms the stratum e is greatly heated, is immediatelythereafter,

as it'descends and forms the stratum f subjected to the coolinginfluence of the compressed air in the cooling zone or plane referredto. From this, it follows that the material is first highly heated andimmediately thereafter is substantially cooled, the

compressed air from the tubes (5 participat- 1 ing in both the heatingand the immediately subsequent cooling of the material.

The remaining features ofthe furnace are of secondary importance.

The grate g is of suitable construction to provide for the furthercooling of the ma terial and for its descent through the furnace asabove explained. Suitable feeding or. emptying devices it arearrangedbelow the grate to insure of the uniform downward movement of thematerial through the furnace. The products of combustion escape througha ventilator z.

I claim herein as my invention:

1. The herein-described process of agglomerating flue dust or otherfinely ,di-

videdmaterial which consists in moistening the said material,charging'the same together with fuel in a shaft furnace and introducingcompressed air into said material in an annular zone, whereby a stratumof the material is subjected to high heat and is immediately thereafterrapidly cooled.

2. The herein described process of burning or agglomerating materialssuch as dust from the throats of high furnaces or fine ore, whichconsists in moistening the said materials, charging the same togetherwith fuel in a shaft furnace, and suddenly subjecting the same to highheat and'rapidly L cooling the same prior to their discharge 15 from theshaft furnace by supplying there to compressed air in a directiontangentially of the mner part of the furnace.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit- 20 messes.

CARL GIESECKE.

